Maestro n° 101 : Page 86 - Gr 83
L5C1 -8- L5C8 =8= L1C8 -8- L1C5 =8= L8C5 -8- L8C2 =8=1= L8C2 -1- L5C2 =1= L5C1 donc L5C1 ≠ 8